It’s a logical consequence of the premises. The instant there’s a split, all branches except the one you’re in become totally and permanently unreachable by any means whatever. If they did not, the conservation laws would be violated.
If all other interpretations made testable predictions, it wouldn’t be enough unless you could somehow eliminate any possibility that didn’t make the list because nobody’s thought of it yet. It’s like the fallacy in Pascal’s Wager: all possible religions belong in the hat.
I took the survey.
I didn’t like it because some of the questions offered too narrow a range of answers for my taste. Example: I consider the “many worlds” hypothesis to be objectively meaningless (because there’s no possible experiment that can test it). The same goes for “this universe is a simulation.”
As for the “singularity”, I see it as nearly meaningless too. Every definition of it I’ve seen amounts to a horizon, beyond which the future (or some aspects of it) will be unimaginable—but from how far past? Like a physical horizon, if such a “limit of vision” exists it must recede as you approach it. Even a cliff can be looked over.